[op25-dev] Runtime error- ioctl(d_tap, TUNSETIFF, &ifr): Operation not permitted

Has anyone seen this error? i cant find anything on the web about this. I already had to disable the Waterfall sink and the FFT sink in order to get rid of the "AttributeError: 'gr_hier_block2_sptr' object has no attribute 'set_callback'" error. Now OP25 dies this way: Imported legacy fsk4 Using Volk machine: ssse3_32 RTL2832 Source block configuration: Read length (bytes): 262144 Buffer enabled: yes Buffer multiplier: 8 Buffer size (samples): 1048576 Samples per read: 131072 Buffer level: 50.0% Successfully initialised demod: "ezcap EzTV" Probing "e4k"...not found. Probing "fc0013"...not found. Probing "fc2580"...bad check value. Probing "fc0012"...not found. Probing "e4000"...not found. Could not find tuner automatically after probe Found RTL2832 device: ezcap EzTV (tuner: interface not implemented) Sample rate range: 900001 - 3200000 Hz Crystal frequency: 28800000 Hz Wait delay: 196.608 ms ioctl(d_tap, TUNSETIFF, &ifr): Operation not permitted Using legacy decoder_ff I'm using Unbuntu 12.10, GNUradio 3.6.3, python 2.7.3, and NooElec R820T RTL2832 stick. I installed GNUradio using the build script on Balint's "how to build page" but OP25 I had to build from source because the build script there has a broken link. Any help will be much appreciated.